Note 2 - Loans and Allowance for Credit Losses - Allowance for Credit Losses on Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Balance	$ 8,225	$ 7,674	$ 7,674
Provision for credit losses	2	134	706
Balance	10,650	$ 7,788	8,225
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	2,342
Balance			2,342
Unfunded Loan Commitment [Member]
Balance	35
Provision for credit losses	0
Balance	242		35
Unfunded Loan Commitment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	$ 207
Balance			$ 207